Question: When was the attempted coup d'etat during the rule of King Juan Carlos I of Spain?
Paraphrase: When was the endeavored upset d'etat amid the run the show of Lord Juan Carlos I of Spain?
SPARQL (Wikidata):  select distinct ?obj where { wd:Q19943 wdt:P793 ?obj . ?obj wdt:P31 wd:Q25906438 } 
Answer: 23-F